Protection Relays & Controls
© 2013 Littelfuse Protection Relays & Controls
Rev: 4-A-050213
Based on Manual Rev 10-A-041213
Littelfuse.com/se-701
A
B
C
L2
L1
GROUNDED
SUPPLY
SE-701 SERIES
(Ground-Fault Monitor)
CT
Description
The SE-701 is a microprocessor-based ground-fault relay for resistance-
and solidly-grounded systems. In addition to common systems, it is
uniquely suited for use on systems with significant harmonic content.
The SE-701 can provide main-plant protection, feeder-level protection,
or individual-load protection. Proper current transformer selection
provides the desired pickup range. The output contacts can be
connected for use in protective tripping circuits or in alarm indication
circuits. The analog output can be used with a PLC or a meter.
SE-701 SERIES (PGR-5701)
Ground-Fault Monitor
Specifications
IEEE Device Numbers Ground fault (50G/N, 51G/N)
Input Voltage See ordering information
Dimensions
H 75 mm (3.0"); W 55 mm (2.2"); D 115 mm (4.5")
Trip Level Settings 1-99% CT-Primary Rating
Trip Time Settings 0.05-2.5 s
Contact Operating Mode Selectable fail-safe or non-fail-safe
Harmonic Filtering Standard feature
Test Button Standard feature
Reset Button Standard feature
CT-Loop Monitoring Standard feature
Output Contacts Isolated Form A and Form B
Approvals
CSA certified
, UL Listed (E340889),
CE (European Union), C-Tick (Australian)
Analog Output 0-5 V
Conformally coated Consult factory
Warranty 5 years
Mounting DIN, Surface (standard)
Panel (with PMA-55 or PMA-60 adapter)
ORDERING NUMBER CONTROL POWER
SE-701-OU 120/240 Vac/Vdc
SE-701-OD 12/24 Vdc
SE-701-OT 48 Vdc
SE-701-O3 24 Vac
Ordering Information
Simplified Circuit Diagram
FEATURES BENEFITS
Adjustable pickup
(1-99%)
Trip setting based on input CT primary, allows use with
any CT. Minimum 50 mA with EFCT Series.
Adjustable time delay
(50 ms - 2.5 s)
Adjustable trip delay allows quick protection and system
coordination
Output contacts
Form A and Form B ground-fault output contacts for
operation of separate annunciation and trip circuits
Analog output
(0 - 5 V)
Allows for connecting an optional meter (PGA-0500) or a
control system
CT-Loop monitoring Alarms when CT is not connected
Selectable DFT or peak
detection filtering
Compatible with variable-speed drives
Harmonic filtering Eliminates nuisance tripping
Non-volatile trip
memory
Retains trip state while de-energized to simplify
troubleshooting
Microprocessor based No calibration required, saves on maintenance cost
Universal power supply
Allows operation in application where one side of PT is
faulted, provides flexibility for numerous applications
Features & Benefits
Note: For optional conformal coating please consult factory.
ACCESSORIES REQUIREMENT
Current Transformer Required
PGA-0500 Optional
PMA-55, PMA-60 Optional
SE-EFVC Voltage Clamp Optional
Accessories
Ground-Fault Current Transformer
Required current transformer model depends on
application. We offer a variety of sensitive CTs with
5- and 30-A primaries.
PGA-0500 Analog % Current Meter
Optional panel-mounted analog meter displays
ground-fault current as a percentage of the CT
primary rating.
A
B
A
Ground-Fault Protection–Grounded Systems
(2 Seiten)
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